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University of Maryland
(343 results)-
White Papers
On Opportunistic Cooperation for Maximizing the Stability Region With Multipacket Reception
August 13, 2009, 12:00am PDT
The authors investigate the composite effects of Multi-Packet Reception (MPR) and relaying capability in affecting the stability region of a wireless network. With a general MPR channel, a...
Provided by University of Maryland
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White Papers
Enabling MAC Protocol Implementations on Software-Defined Radios
March 2, 2010, 12:00am PST
Partial packet recovery protocols attempt to repair corrupted packets instead of retransmitting them in their entirety. Recent approaches have used physical layer confidence estimates or...
Provided by University of Maryland
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White Papers
Dynamic Spectrum Access Using the Interference Temperature Model
January 20, 2009, 12:00am PST
To combat spectral overcrowding, the FCC investigated new ways to manage RF resources. The idea was to let people use licensed frequencies, provided they can guarantee interference perceived by...
Provided by University of Maryland
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White Papers
Game Theoretical Mechanism Design for Cognitive Radio Networks With Selfish Users
July 23, 2008, 12:00am PDT
Dynamic spectrum access with cognitive radios has become a promising approach to improve spectrum efficiency by adaptively coordinating different users' access according to spectrum dynamics....
Provided by University of Maryland
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White Papers
Secure Handover in Enterprise WLANs: CAPWAP, HOKEY, and IEEE 802.11r
July 9, 2008, 12:00am PDT
As Wireless LANs become more and more ubiquitous, the number and types of applications they are supporting is ever-increasing. As real-time performance requirements begin to emerge, the latency...
Provided by University of Maryland
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White Papers
Channel-Like Fingerprinting Overlays for Authenticating OFDM Signals Using Channel Side Information
January 4, 2011, 12:00am PST
The authors present a method for overlaying Orthogonal Frequency Division Multiplexing (OFDM) transmissions with a fingerprint message at the physical-layer, where the fingerprint signal conveys a...
Provided by University of Maryland
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White Papers
Physical Layer Authentication Watermarks Through Synthetic Channel Emulation
January 29, 2010, 12:00am PST
The authors present an authentication device allowing for the validation of wireless transmissions by means of a watermark signal applied at the physical layer, and demonstrate how the method may...
Provided by University of Maryland
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White Papers
Best-Effort Cooperative Communication Without Dedicated Relays
September 14, 2009, 12:00am PDT
Traditional decode-and-forward cooperation systems consider dedicated relays, while instead the authors wireless transceivers that cooperatively relay signals in addition to primary communication...
Provided by University of Maryland
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White Papers
Evolutionary Game Framework for Behavior Dynamics in Cooperative Spectrum Sensing
March 30, 2008, 12:00am PDT
Cooperative spectrum sensing has been shown to greatly improve the sensing performance in cognitive radio networks. However, if the cognitive users belong to different service providers, they tend...
Provided by University of Maryland
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White Papers
Collusion-Resistant Multi-Winner Spectrum Auction for Cognitive Radio Networks
March 28, 2008, 12:00am PDT
In order to fully utilize spectrum, auction-based dynamic spectrum allocation has become a promising approach which allows unlicensed wireless users to lease unused bands from spectrum license...
Provided by University of Maryland
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White Papers
Wireless Digital Modulation and Space-Time Coding Forensics Detector for Spectrum Sensing
July 11, 2008, 12:00am PDT
Modulation forensics detect the modulation type in wireless communications by the received signal only. It provides a powerful tool for spectrum sensing since by identifying the modulation type,...
Provided by University of Maryland
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White Papers
A Multi-Winner Cognitive Spectrum Auction Framework With Collusion-Resistant Mechanisms
June 6, 2008, 12:00am PDT
Dynamic spectrum access, enabled by cognitive radio technologies, has become a promising approach to improve efficiency in spectrum utilization, and the spectrum auction is one approach in which...
Provided by University of Maryland
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White Papers
Security in Cognitive Radio Networks: Threats and Mitigation
January 1, 2011, 12:00am PST
This paper describes a new class of attacks specific to cognitive radio networks. Wireless devices that can learn from their environment can also be taught things by malicious elements of their...
Provided by University of Maryland
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White Papers
Channel Estimation and Adaptive M-QAM in Cognitive Radio Links
February 27, 2008, 12:00am PST
Cognitive radios have the ability to sense their RF environment and adapt their transmission parameters to perform optimally in any situation. Part of this involves selecting the best modulation...
Provided by University of Maryland
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White Papers
Planning Approach to Dynamic Spectrum Access in Cognitive Radio Networks
January 1, 2011, 12:00am PST
Over the past few years, significant effort has been put into various treatments of dynamic spectrum access. This paper has resulted in a many protocols and heuristic techniques for coexistence...
Provided by University of Maryland
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White Papers
Making the Case for EAP Channel Bindings
February 20, 2009, 12:00am PST
In current networks that use EAP and AAA for authenticated admission control, such as WiFi, WiMAX, and various 3G internetworking protocols, a malicious base station can advertise false...
Provided by University of Maryland
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White Papers
Partitioning Detection and Connectivity Restoration Algorithm for Wireless Sensor Actor Networks
February 5, 2011, 12:00am PST
Recently, Wireless Sensor and Actor Networks have been receiving a growing attention from the research community because of their suitability for critical applications. Maintaining inter-actor...
Provided by University of Maryland
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White Papers
Protocol-Level Cooperation in Wireless Networks: Stable Throughput and Delay Analysis
August 13, 2009, 12:00am PDT
The authors study the impact of user cooperation in wireless networks on improving the stable throughput and delay performance. Specifically, they consider a multi-access system in which a set of...
Provided by University of Maryland
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White Papers
Cooperation Above the Physical Layer: The Case of a Simple Network
August 13, 2009, 12:00am PDT
In this paper, the authors investigate the effects of "Network-level" cooperation in a wireless three-node network with packet erasure links. Cooperation is achieved through the relaying of...
Provided by University of Maryland
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White Papers
A Cross-Layer View of Wireless Multicasting Under Uncertainty
April 13, 2009, 12:00am PDT
In this paper, the authors study the problem of scheduling through rate and power control for multi-cast traffic. Their objective is to maximize the total user utility where user utilities are...
Provided by University of Maryland
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White Papers
Wiretap Channels: Implications of the More Capable Condition and Cyclic Shift Symmetry
October 18, 2011, 12:00am PDT
Characterization of the rate-equivocation region of a general wiretap channel involves two auxiliary random variables: U, for rate splitting and V, for channel prefixing. Evaluation of regions...
Provided by University of Maryland
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White Papers
Optimal Packet Scheduling in a Multiple Access Channel With Energy Harvesting Transmitters
June 1, 2011, 12:00am PDT
In this paper, the authors investigate the optimal packet scheduling problem in a two-user multiple access communication system, where the transmitters are able to harvest energy from the nature....
Provided by University of Maryland
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White Papers
Multi-Receiver Wiretap Channel With Public and Confidential Messages
June 1, 2011, 12:00am PDT
The authors study the multi-receiver wiretap channel with public and confidential messages. In this channel, there is a transmitter that wishes to communicate with two legitimate users in the...
Provided by University of Maryland
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White Papers
Capacity-Equivocation Region of the Gaussian MIMO Wiretap Channel
May 3, 2010, 12:00am PDT
The authors study the Gaussian Multiple-Input Multiple-Output (MIMO) wiretap channel, which consists of a transmitter, a legitimate user, and an eavesdropper. In this channel, the transmitter...
Provided by University of Maryland
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White Papers
Capacity Region of Gaussian MIMO Broadcast Channels With Common and Confidential Messages
February 25, 2010, 12:00am PST
The authors study the two-user Gaussian Multiple-Input Multiple-Output (MIMO) broadcast channel with common and confidential messages. In this channel, the transmitter sends a common message to...
Provided by University of Maryland
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White Papers
Optimal Packet Scheduling in an Energy Harvesting Communication System
June 9, 2010, 12:00am PDT
The authors consider the optimal packet scheduling problem in a single-user energy harvesting wireless communication system. In this system, both the data packets and the harvested energy are...
Provided by University of Maryland
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White Papers
An Alternative Proof for the Capacity Region of the Degraded Gaussian MIMO Broadcast Channel
February 18, 2010, 12:00am PST
The Gaussian Multiple-Input Multiple-Output (MIMO) broadcast channel consists of one transmitter and an arbitrary number of receivers, where the transmitter and receivers are equipped with...
Provided by University of Maryland
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White Papers
A Demo of Coco: A Compiler for Monadic Coercions in ML
August 29, 2011, 12:00am PDT
Combining monadic computations may induce a significant syntactic overhead. To allow monadic programming in direct style, the authors have developed Coco, a type-based tool that automatically...
Provided by University of Maryland
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White Papers
Directed Symbolic Execution
June 10, 2011, 12:00am PDT
In this paper, the authors study the problem of automatically finding program executions that reach a particular target line. This problem arises in many debugging scenarios; for example, a...
Provided by University of Maryland
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White Papers
Evaluating Dynamic Software Update Safety Using Systematic Testing
September 23, 2011, 12:00am PDT
Dynamic Software Updating (DSU) systems patch programs on the fly without incurring downtime. To avoid failures due to the updating process itself, many DSU systems employ timing restrictions....
Provided by University of Maryland
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White Papers
Dynamic Enforcement of Knowledge-Based Security Policies
April 21, 2011, 12:00am PDT
This paper explores the idea of knowledge-based security policies, which are used to decide whether to answer queries over secret data based on an estimation of the querier's (possibly increased)...
Provided by University of Maryland
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White Papers
State Transfer for Clear and Efficient Runtime Updates
January 4, 2011, 12:00am PST
Dynamic Software Updating (DSU), the practice of updating software while it executes, is a lively area of research. The DSU approach most prominent in both commercial and research systems is...
Provided by University of Maryland
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White Papers
MultiOtter: Multiprocess Symbolic Execution
August 5, 2011, 12:00am PDT
Symbolic execution can be an effective technique for exploring large numbers of program paths, but it has generally been applied to programs running in isolation, whose inputs are files or...
Provided by University of Maryland
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White Papers
Tests to the Left of Me, Types to the Right: How Not to Get Stuck in the Middle of a Ruby Execution
June 9, 2009, 12:00am PDT
Ruby is a popular dynamic scripting language that permits terse, expressive code, but provides no static checks to detect errors be-fore running the program. To address this, the authors have...
Provided by University of Maryland
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White Papers
Specifying and Verifying the Correctness of Dynamic Software Updates
December 2, 2010, 12:00am PST
Recently, there has been much interest in Dynamic Software Updating (DSU) systems, which allow running programs to be patched on-the-fly to add features or fix bugs. Open-source and commercial...
Provided by University of Maryland
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White Papers
Kitsune: Efficient, General-Purpose Dynamic Software Updating for C
January 18, 2012, 12:00am PST
Dynamic Software Updating (DSU) systems allow programs to be updated while running, thereby allowing developers to add features and fix bugs without downtime. This paper introduces Kitsune, a new...
Provided by University of Maryland
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White Papers
The Network Stack Trace: Performance Diagnosis for Networked Systems
October 4, 2011, 12:00am PDT
Transient network stalls that degrade application performance are frustrating to users and developers alike. Software bugs, network congestion, and intermittent connectivity all have the same...
Provided by University of Maryland
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White Papers
Link Mining: A New Data Mining Challenge
January 1, 2008, 12:00am PST
A key challenge for data mining is tackling the problem of mining richly structured datasets, where the objects are linked in some way. Links among the objects may demonstrate certain patterns,...
Provided by University of Maryland
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White Papers
Distributed Data Mining in Peer-to-Peer Networks
January 1, 2008, 12:00am PST
Distributed data mining deals with the problem of data analysis in environments with distributed data, computing nodes, and users. Peer-to-peer computing is emerging as a new distributed computing...
Provided by University of Maryland
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White Papers
ITree: Efficiently Discovering High-Coverage Configurations Using Interaction Trees
September 30, 2011, 12:00am PDT
Software configurability has many benefits, but it also makes programs much harder to test, as in the worst case the program must be tested under every possible configuration. One potential remedy...
Provided by University of Maryland
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White Papers
Network Connectivity and Related Optimization Problems on Random Graphs
December 23, 2009, 12:00am PST
Network connectivity and propagation problems arise naturally in many social networks. The authors examine problems where some property, such as an infection or influence, starts from some...
Provided by University of Maryland
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White Papers
Integrating DFM With CAD Through Design Critiquing
September 27, 2010, 12:00am PDT
The increasing focus on Design For Manufacturability (DFM) in research in concurrent engineering and engineering design is expanding the scope of traditional design activities in order to identify...
Provided by University of Maryland
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White Papers
Improved Data Acquisition System for CREAM-III
June 19, 2007, 12:00am PDT
The CREAM (Cosmic Ray Energetics And Mass) Data AcQuisition (CDAQ) system showed excellent stability and robustness during the 2004/05 and 2005/06 Antarctic campaigns. One improvement for the...
Provided by University of Maryland
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White Papers
Sub-Saharan Growth Surprises: Geography, Institutions And History in an all African Data Panel
September 1, 2010, 12:00am PDT
The authors use two types of cross-country growth regression models to revisit explanations of slow growth in Africa looking at growth rate variation among African countries only. Both sets of...
Provided by University of Maryland
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White Papers
Crafting Integrated Multichannel Retailing Strategies
January 1, 2010, 12:00am PST
Multichannel retailing is the set of activities involved in selling merchandise or services to consumers through more than one channel. Multichannel retailers dominate today's retail landscape....
Provided by University of Maryland
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White Papers
Finding and Removing Performance Bottlenecks in Large Systems
January 1, 2011, 12:00am PST
Software systems obey the 80/20 rule: aggressively optimizing a vital few execution paths yields large speedups. However, finding the vital few paths can be difficult, especially for large systems...
Provided by University of Maryland
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White Papers
New Directions In Goal-Setting Theory
November 7, 2007, 12:00am PST
Goal-setting theory is summarized regarding the effectiveness of specific, difficult goals; the relationship of goals to affect; the mediators of goal effects; the relation of goals to...
Provided by University of Maryland
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White Papers
Maranello: Practical Partial Packet Recovery for 802.11
March 2, 2010, 12:00am PST
Partial packet recovery protocols attempt to repair corrupted packets instead of retransmitting them in their entirety. Recent approaches have used physical layer confidence estimates or...
Provided by University of Maryland
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White Papers
PEGASUS: 802.11 Connectivity at High Speed
September 9, 2007, 12:00am PDT
Measurements and ongoing research have shown that WLAN connection for moving vehicles is feasible. However none of the previous works suggests a solution addressing a complete array of the...
Provided by University of Maryland
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White Papers
Cloud-Based Decision Support Systems and Availability Context: The Probability of Successful Decision Outcomes
May 27, 2009, 12:00am PDT
In an age of cloud computing, mobile users, and wireless networks, the availability of decision support related computing resources can no longer guarantee five-nines (99.999%) availability but...
Provided by University of Maryland
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White Papers
Is There a Cloud in Your Future?: Applications of "Cloud Computing" to Web-Scale Problems
March 17, 2008, 12:00am PDT
Cloud computing refers to technology for exploiting large computer clusters to tackle "Web-scale" information processing problems, where immense quantities of data make traditional sequential...
Provided by University of Maryland
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White Papers
Can There Be a Standard in Service Level Agreements for Cloud Computing?
December 1, 2008, 12:00am PST
Cloud computing is changing everything; every day new topics on the subject emerge. Data of every type is being placed within the cloud. In doing this, there is much uncertainty and fear as the...
Provided by University of Maryland
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White Papers
Using Virtualization and Live Migration in a Scalable Mobile Wireless Testbed
June 7, 2010, 12:00am PDT
Laboratory-based mobile wireless testbeds such as MeshTest and the CMU Wireless Emulator are powerful platforms that allow users to perform controlled, repeatable, mobile wireless experiments in...
Provided by University of Maryland
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White Papers
A Quick Read On The State Of Small Business And The Small Business Success Index
March 12, 2009, 12:00am PDT
Competitiveness in this context is defined as the level of success a small business achieves in conducting the organizational activities critical to its short and long term viability. The more...
Provided by University of Maryland
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White Papers
Security Through Collaboration in MANETs
October 19, 2008, 12:00am PDT
It is well understood that Mobile Ad Hoc NETworks (MANETs) are extremely susceptible to a variety of attacks, and traditional security mechanisms do not work well. Many security schemes have been...
Provided by University of Maryland
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White Papers
On Secure Communication Over Wireless Erasure Networks
January 14, 2008, 12:00am PST
A special network model which incorporates the broadcast nature of wireless transmission and models each link as a memoryless erasure channel has proven to be a useful abstraction to study...
Provided by University of Maryland
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White Papers
Secure Spaces: Location-Based Secure Wireless Group Communication
January 1, 2010, 12:00am PST
This paper defines "Secure Space" as an enclosed area within which wireless devices can participate in secure group communication. A device is able to join a secure space group by the virtue of...
Provided by University of Maryland
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White Papers
Disappearing Dividends, Catering, And Risk
December 1, 2007, 12:00am PST
Fama and French (2001a) show that the propensity to pay dividends declines significantly between 1978 and 1999. The authors examine this "Disappearing dividends" puzzle through the lens of risk...
Provided by University of Maryland
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White Papers
Maximizing Path Durations in Mobile Ad-Hoc Networks
January 1, 2010, 12:00am PST
The authors study the problem of path selection in mobile ad-hoc networks. Based on the earlier results the authors propose a novel scheme that maximizes the expected durations of selected paths...
Provided by University of Maryland
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White Papers
Sectored Random Projections for Cancelable Iris Biometrics
December 22, 2009, 12:00am PST
Privacy and security are essential requirements in practical biometric systems. In order to prevent the theft of biometric patterns, it is desired to modify them through revocable and non...
Provided by University of Maryland
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White Papers
Design and Evaluation of a Common Access Point for Bluetooth, 802.11 and Wired LANs
January 1, 2010, 12:00am PST
Devices using wireless technologies like Bluetooth and 802.11b will be ubiquitous in the near future. The technologies supporting these devices will need to co-exist in order to support smooth...
Provided by University of Maryland
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White Papers
Bluetooth Traffic Monitoring Technology
September 24, 2008, 12:00am PDT
Beginning in late 2007 the University of Maryland, with support from the Maryland State Highway Administration, developed an anonymous probe technique to monitor the travel time on highways and...
Provided by University of Maryland
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White Papers
Middleware for Scientific Computing on GPUs From Fortran 95
September 27, 2008, 12:00am PDT
Scientific computing and numerical analysis techniques have been widely adapted and implemented in the Fortran language since its inception. Many successive versions of Fortran have allowed new...
Provided by University of Maryland
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White Papers
Middleware for Programming NVIDIA GPUs From Fortran 9X
November 21, 2007, 12:00am PST
There is a revolution taking place in computing with the availability of commodity graphical processors capable of several hundred gigaflop performance and with multicore CPUs. Using these it...
Provided by University of Maryland
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White Papers
Admission Control for Multihop Wireless Backhaul Networks With QoS Support
January 1, 2010, 12:00am PST
Despite improvements in wireless access technologies such as 3G or 802.11x, ubiquitous data access has remained a challenge, mainly due to the lack of inexpensive, pervasive backhaul connections...
Provided by University of Maryland
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White Papers
An Accurate Technique for Measuring the Wireless Side of Wireless Networks
January 1, 2010, 12:00am PST
Wireless Monitoring (WM) is a passive approach for capturing wireless-side traffic with rich MAC/PHY layer information. WM can suffer, however, from low capture performance, i.e., high measurement...
Provided by University of Maryland
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White Papers
Multiscale Analysis for Wireless LAN Traffic Characterization
January 1, 2010, 12:00am PST
In this paper, the author's overview the various network traffic models, especially focusing on the multiscale analysis. By multiscale analysis the authors mean wavelet-based self-similar and...
Provided by University of Maryland
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White Papers
COSI: Cloud Oriented Subgraph Identification in Massive Social Networks
May 25, 2010, 12:00am PDT
Subgraph matching is a key operation on graph data. Social Network (SN) providers may want to find all subgraphs within their social network that "Match" certain query graph patterns....
Provided by University of Maryland
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White Papers
Multi-Objective Optimization Techniques in Topology Control of Free Space Optical Networks
May 8, 2008, 12:00am PDT
To mitigate the effects of obscuration and attenuation, Free Space Optical (FSO) wireless networks employ topology control to dynamically reconfigure node connectivity based on changes in link...
Provided by University of Maryland
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White Papers
Semi-Automatic Composition of Web Services Using Semantic Descriptions
January 1, 2010, 12:00am PST
As web services become more prevalent, tools will be needed to help users find, filter and integrate these services. Composing existing services to obtain new functionality will prove to be...
Provided by University of Maryland
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White Papers
Semantic Web Service Composition in Social Environments
August 14, 2009, 12:00am PDT
This paper describes how to generate compositions of semantic Web services using social trust information from user ratings of the services. The authors present taxonomy of features, such as...
Provided by University of Maryland
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White Papers
Debugging Support for Data Warehouse Applications
May 18, 2010, 12:00am PDT
The paper describes a model-based approach to developing a general tool for localizing faults in applications of data warehouse technology. A model of the application is configured from a library...
Provided by University of Maryland
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White Papers
Delay Tolerant Network Routing: Beyond Epidemic Routing
November 12, 2008, 12:00am PST
In this paper, authors identify two distinct classes of routing algorithms for Delay or Disruption Tolerant Networks (DTN). The purpose of this classification is to clearly delineate the...
Provided by University of Maryland
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White Papers
Adapting Network Structure for Efficient Team Formation
January 1, 2010, 12:00am PST
The concept of team formation is central to a wide variety of disciplines, including planning and learning in multiagent systems, artificial social systems, and distributed artificial...
Provided by University of Maryland
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Case Studies
On Web, Semantics, and Data Mining: Intrusion Detection as a Case Study
January 1, 2010, 12:00am PST
Data mining is defined as the process of discovering implicit, non trivial knowledge from large consolidated databases. This is done with the aim of using it to support tactical and strategic...
Provided by University of Maryland
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White Papers
Principles of Proper Inferences From Complex Survey Data
March 19, 2010, 12:00am PDT
This paper discusses commonly-encountered features of complex survey datasets that should be accounted for by employing the SURVEY family of SAS procedures. Concepts of clustering, stratification,...
Provided by University of Maryland
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White Papers
Introduction to Data Analysis With Spreadsheets
January 24, 2009, 12:00am PST
In this physics laboratory one will use computer spreadsheets to record and analyze the data. This lab is a tutorial which teaches one about spreadsheets in general and specifically introduces a...
Provided by University of Maryland
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White Papers
Weathering the Storm: The Policy Implications of Cloud Computing
February 1, 2009, 12:00am PST
Throughout the history of computing, there have been several paradigm shifts from main-frames to mini computing to micro-processing to networked computers. On track to be the next major paradigm...
Provided by University of Maryland
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White Papers
Temporal Visualization of Planning Polygons for Efficient Partitioning of Geo-Spatial Data
January 1, 2010, 12:00am PST
Partitioning of geo-spatial data for efficient allocation of resources such as schools and emergency health care services is driven by a need to provide better and more effective services....
Provided by University of Maryland
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White Papers
Visualizing Multivariate Time Series Data to Detect Specific Medical Conditions
July 12, 2008, 12:00am PDT
Efficient unsupervised algorithms for the detection of patterns in time series data, often called motifs, have been used in many applications, such as identifying words in different languages,...
Provided by University of Maryland
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